1/* 2 * Copyright (C) 2011 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27#include "CGUtilities.h" 28 29#include <wtf/RetainPtr.h> 30 31namespace WebKit { 32 33void paintImage(CGContextRef context, CGImageRef image, CGFloat scaleFactor, CGPoint destination, CGRect source) 34{ 35 CGContextSaveGState(context); 36 37 CGContextClipToRect(context, CGRectMake(destination.x, destination.y, source.size.width, source.size.height)); 38 CGContextScaleCTM(context, 1, -1); 39 40 CGFloat imageHeight = CGImageGetHeight(image) / scaleFactor; 41 CGFloat imageWidth = CGImageGetWidth(image) / scaleFactor; 42 43 CGFloat destX = destination.x - source.origin.x; 44 CGFloat destY = -imageHeight - destination.y + source.origin.y; 45 46 CGContextDrawImage(context, CGRectMake(destX, destY, imageWidth, imageHeight), image); 47 48 CGContextRestoreGState(context); 49} 50 51void paintBitmapContext(CGContextRef context, CGContextRef bitmapContext, CGFloat scaleFactor, CGPoint destination, CGRect source) 52{ 53 RetainPtr<CGImageRef> image = adoptCF(CGBitmapContextCreateImage(bitmapContext)); 54 paintImage(context, image.get(), scaleFactor, destination, source); 55} 56 57} // namespace WebKit 58